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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '447dc8382fb75bebb3161bb755dd3e254904a358ddc691af67ea1a1ac2ade3de' 
  AND token = 'XInsBPtTRxuzTp+i3zUPMybesuWa2/7OToLLjlnYHxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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