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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd8d6d66f3dddd26cd413831b60bfc3d0c2c63dfd901e2ef141a0be31c4e1275' 
  AND token = 'J0sAzfviZuR7WkX6PYvGtW0l+nC3aPwYWgA3PRw9A4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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