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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63af1a5e407e045c00f73b7dbb59f58cae18dadb1f85a11ffc888be8f00be057' 
  AND token = 'SMJ0BisC0cp2QYJcd+K2j6Uz4PFPMP4EmFksp7HrQ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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