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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dc2cefcdf86f00aadacaf7608fc797221c848a2402f19def5e8390d92480285' 
  AND token = 'lRY3/rLAcGdAHmsSu6IupMuFkV5GCvgkwDTrti866Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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