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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a8ab5319239a6ddef19b6901c9ce8960a6c9fe25543a80c88e42d8b6e4fe703' 
  AND token = 'RnyODL5ppLdM4EPTNiBGpiJ2A6+ycbpMvCTr+Wrj/y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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