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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '934f71a019f333e5c4c6781fbd806ef905f77f011ad3368a1592c80ea907ddeb' 
  AND token = 'x52KrsxLbSmLrlU2JIb7XC34SWMdhsQK3gFPZGoxWlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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