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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfa1a2e87c4614b3cf7689d00efb6b6405eb9e6815aa2b8d7ef48d68c5a29728' 
  AND token = 'lShMlq5kb4eHzSYwFUfuL9J+rZ5n5OERIzIp23hS6dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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