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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0b735f71adb9b2c8b8fd7d42b2a2cd8b2de7ab098dd29b6686de038086e4998' 
  AND token = 'jn4xdqVEseVlJB2BV/dAz6DILoAG+AcCogPE6ds+k8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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