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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44060c4df0b499cc2b402f59c047407f363abc867335463f5f6a09c5a66961e4' 
  AND token = 'GOtBUr0tB0OmdyrEUP09R5UWsab0yVKq2TT9RuCgGf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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