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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '721bb0ca90087e02fc0623fd27618ab6a0cbe53587ab377030f3ff5302cc6908' 
  AND token = '9973fRV9RwseCNSczMNiL1XJBAe7Yo+NI45jYsWKdsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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