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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3657f98ed7d6f7dfe2aca00b0ca964457d372c68f47a51430b67e553f04347c7' 
  AND token = 'EMAEhESCADVNPH6aJWSAwd6ThX4swHPPMZ2EI9LexVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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