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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6ad203bd7ab3c4b946f03556b6e2061e205e8f6af0ef140be25e26650f036b1' 
  AND token = 'c27Y/ht6TBpIZSVXhh3+/6xxRrrczmlXwymMnLSnlyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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