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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c449a11011a55b10b4c7660a4bc4bc6326e6a932b12a78d53677b8b0fb08a651' 
  AND token = 'IoLZZx1NxOGJVnfl/2kjB2WAP713TrGQ1Ri7BTzD3eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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