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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '678060860f3a6ce4a69787b406e257470ae892644014f9a560f8e20f1959db94' 
  AND token = 'UudcZY10KKthQYKaYRUEeKlgujnkurgXCjnXAI6PHVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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