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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9b3c4eda6db3cc3a5142780f5c3ca389229dfb1ee3d480a7c62daa870ddca88' 
  AND token = 'DRoDOyN2LyqiRyoeBAHVR6u6vEUHxOmRU/+/mfJsp2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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