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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33517eaeb50b570d15832690826699273e80f0684ccd05cd5b55e5ba86512a4d' 
  AND token = '4ZjK0IGPJtRFAfVWSc6wpmMV6r5SA04PvlcVP2HTkTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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