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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77999e59c3b42be7cfb46db0242e286afad72fd8ac6969feb821f1ec0020525c' 
  AND token = 'etDD/8ZJvB5iV7uW8vpwitWX/LHt2NuIdkwCswZA0bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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