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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fac7ddacf59f9cfea9112aa414ac297c4c2868caa08f4c076bc36ffc62206167' 
  AND token = '1aHXNCjccoxpyb0BiXUsIXrotmJ0xwqPTDCjYwM9jcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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