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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27527997b7fc988e724ea6e8916b63c36a4123f8cd323e6672bbad6e67d0d26a' 
  AND token = 'eLNEuNR+RwaLwEZdiX3b42JSDI/aQPM7DUvN3trMDwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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