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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b42f3ae03e6e380721e8d8fa65e1bc15df1a6d83ab9d0b4e2a796c4a15b0706' 
  AND token = 'D6i2l4oJs9mnWmw+6n8etYXsZCd1wxiHNcsc0yO4kk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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