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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99404203837885e46fcf505fcc16d0d395099d1305e6edb820fe6e49d6027606' 
  AND token = 'iWzQKLAp9LN9s6tryNCZBpAkh5CC7h8vbGxeOAR8sK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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