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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0d40987396e2d44f953e6d26063422a9728bfd64c68055cbc61c43173fe1d3a' 
  AND token = 'N/v+gmQZ4xkZekCnmA2or8irta5m8Va9lyrAu4s8HVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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