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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd554396dc4986e0e0192a10535c16575bd65a45261ff8e78eec2d95f4f95fa56' 
  AND token = 'K0HEzU44mA96nqiS4bnPqpMVuCdAx73tD7KnVBp7cF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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