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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4402ab9d146636baa09dc6246a54505d0f0e77f9d374976577508d778c314cb9' 
  AND token = '3hzAFHpRNVg6UqMGRTeIQ/WeklPE4/E4pthInsEAjyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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