SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8f0be8cd6c014fc263d632f08cb89ded4b137089ff973d9865a392a118ab2e0' 
  AND token = '7A5ojsi+z3Cs9OFoKxPLzcupR5LdOJqaxmLrB4MDu7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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