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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6614195e96f3d4ef2ee31a89ef7d773b4e3bf36ab9d9a737df0f72d0a79ad059' 
  AND token = 'B31CjtLD9VFo/3m4D4knu+Pn7w5RZP3FLE/Kqofs+rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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