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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eac96718d4b848bc8d934246af9497e6676ae5a4cec6a1637db1245a8638c22' 
  AND token = 'MkqlyvE1sNUyV5sNWfKdT9vTTAGCrmlAgJAt7PiDykI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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