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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c47c8467a129a87683e8ff19fcb1eb8f4f41dbe9cb05a7c23fbfede5ecfec348' 
  AND token = 'xu7kEStr3jfnmwWkL+NZppyeP4rZh6HWNR2KSCgZojo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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