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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94bdf95e7dee343010affc79045d7eb14ec250c261deec7e8e2c4b96fbc54efc' 
  AND token = 'RQBR4idYi2I1ogowi1IeoBOBJmermZ4d7iZVIAQt+O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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