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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9cfce34c2dbaad357ef3e8a5e416be5c40925b10af8e6a67f217e5c4e79762' 
  AND token = 'qTOT/PC4tFDi6wa00GKI7H7GIKD1+znxUFMOkiQVnTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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