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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5be66301ef1a16f3dae970f45e9ebd9e3f11892a1ae1e4835d4cdae3579b8e29' 
  AND token = 'uAiRhTTg+Ii4lkpG8es/t1PIgUqeeF+igwgqu4Wtx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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