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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3f05e7c6579853ed37328a2679521195445bf916a48a5c318e98b0b5e7a8eaa' 
  AND token = 'm+mHnLBjeaipGx36rOkhxffmcqE/hgZMOE5ljt3cpls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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