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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c67462a3911b82a03baed117d7ac4e1144276c2722164be5e1d72118cb18bf5' 
  AND token = 'skS7u7YfjfxWN7AS+081CuirjzgU73Uvyog1zYUSzKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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