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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52559cb20a3aa8d527fd92efa1da90fd889630609ad79a13345d5eaaa9ebd185' 
  AND token = 'fu3vbsEKbt/+0toWNeROODuy88m7tzoxZD/J70iY5Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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