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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51be7689fe26197fe72e4c8075ee01aae718146e17bd94d2e952f592d6e74226' 
  AND token = '6ZQiem8snfzSYov9HDO7yrcsBofbGWUpqrfkmvZ3rls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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