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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '841f86b0bb55deda431f16fbabd373ebacdbbe1efa2c237b71aac7c08e8495e1' 
  AND token = 'oXzyTJkfJ/EjUlQnYeWIx0E5zJ1JQ4Sm3z0JkkXZAbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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