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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bfe9594cae51cffddb01692757af7995f83087fe7803d987d8601413e166015' 
  AND token = '1o80yuMG0ywcHZAEqHe9zRV3dx6m9NLdDd+MJBgCABI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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