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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0428f22c272a315eee31dc3ada3fb6d6c03681ae2419c39733cc4a9243e7c66' 
  AND token = 'J5XbgDbmh5cNng1Mk1G/7cWSt89x/AacZXv06tV3fyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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