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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b4e2f59b9293b6b32e09716f557c9d79096fa8f69d1cac369860aeee75a6be' 
  AND token = 'qEDxy5UYtAtGU+Gsxsfj6w28N8tTikJln0o8D9vOB4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}