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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdb0aa2699c1cc62c65d57a2de03a407c0129d6edb21b2b9df478a7f54317f40' 
  AND token = 'lR+Tbwi1ti0XQxKlHYEDpp3SD4Y0i42Uw6+HHyL5ZHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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