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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1e796cdac2547dc214de9b5e2d77fcae1132f934d39f70512db4c097181f79d' 
  AND token = 'n9APoMaIaORUkaSXLTt0KPbmSy3Hu+Kh3hwXXZUhj70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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