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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d7bb9a6be23143068f0bc4671dbef87f31d13ef1a1757fca12705fd1957d600' 
  AND token = 'sYLs827zUVUR5lXgat/jz5rx9HU/emjDWaz5jpG7t6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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