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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaef835c48ed3759d322ba3288eec716b3712f561178dc9407e807b9922975cd' 
  AND token = 'khAKO8eRHSanO0RO6FSEPWB8dBUZ36c/CnVCQOyZlQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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