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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52a4708566c522d65ef60dd2def4263062f708efb8cfe0896d2247a2f3027292' 
  AND token = 'MgiHSnA275Jz5HdX4VF34o8SFVDug4HITqkTk5qBvlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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