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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff832727ef88ad27deea0b68911c38662bb65eb7167bd0a723acb910867ce03c' 
  AND token = 'HrbS1RWVyYGb3gpROlDDGq4MEGBCKAEvI7y3BY/cYc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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