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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbf5335f32c07d0ea456477a56ac03dae43d4d2bff0c8edbf3f9bbfc672486c8' 
  AND token = 'sw6cOHOfxZOBs7e6OMz6Al8iyt5z86KvmZ1+oEA3ljA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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