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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884f19ff0632c432db11de1aa6d4674762a13071938d3d7ee9c9a66d00be2920' 
  AND token = 'zHZWB06mFJnB4i1LO8i/huG0rsI3CSk1qx2MeaQn0qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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