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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98662301da1ed5de11fb7b7ca59c6cef50b9be9ebdf4485536d92a627ace82df' 
  AND token = 'M+XZct/X14sBO9w5pT3Jak+F6i8tDBoga2whLoTXAwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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