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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766982b1539f3e1ccbb3c1c81229b1c9d0e4e56d7817ef15566fe6082683120b' 
  AND token = 'FkT5qwaMYliCyoWp49EvPeZ/VxrDchC529pQwJ9I2d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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