SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29d01f819e3a1901fb39d0277d749163b4108874b9c5a4cb342df1917658caf6' 
  AND token = '/dnaE7w+uu1wjWhNblbMWo7lSPgtxr/BfYRpg0wGAMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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