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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0219b7d126f1d4c48f109031327893d3051790e0f4b3f2537b131dd903903fb6' 
  AND token = 'kU9zTuomqtCkjoen2aS2+c1V7JLB4yNkIhjanR7oD48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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