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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4cfc782dfbe83c81a242fa90004499b0f7f323784c8063f6512ee22642cb88c' 
  AND token = '9X3Jxz5oAe3GJ4WDeojBRdX4Cuj6oE7wmwPQHA34nrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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