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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a69d2f94e5189bd17d02c2bc88db39462f1027b16a770a17e5c335495fd8b72' 
  AND token = 'HTvESyVbsr3zugSOBNTTDahl9SRom48vfko2toBGAzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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