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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19dc4caec197126aaa5c0940f0f2af8beaecf8403413818caccbb68a3ce4bbdb' 
  AND token = 'WpTOt9mR3TFau3mzKN5VbmRYkBSbMlCcLmNokZTP4mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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