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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b05da1bd7042e4ae39de8e3b5e8ec749e3866f7e0b6d9c118f6086b8ab411bf' 
  AND token = 'xytVGynBaMq+GnLcONHLYAm2GHNPxJfI5ikc9ov0n8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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