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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd18a6ba824076c53b44986343ef73bc4a5f6e698bc0cd4798f5b423157b3e91' 
  AND token = 'eJtIerYByoONZ7OykefTWRXFF/V4yYmeygJ4NubVh70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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