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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a12e7942d550e3b173c490a76bd20277119edcb188a86a5411982873b9a7f515' 
  AND token = 'sMQ+dN1e5xl9WEyz8lNuL3KIcmW8ppOEpoGXHig9MBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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